Provide a visual element that will collapse/expand the split pane completely

[sdg002]

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Is your feature request related to a problem? Please describe.

I would like a visual element which will collapse the Split pane completely. In a single click, I will get to utilize the full screen real estate. This is very beneficial for users with small screens (e.g. laptops)

Describe the solution you'd like

Example from Azure Devops

Example from Azure portal

Describe alternatives you've considered

Not yet considered any alternative.

Additional context

N.a